Stamping spiral duct fan is widely used

The continuity of the traditional pipeline will be destroyed after punching, which will lead to deformation, deformation and even fracture of the pipeline, which will seriously damage its ventilation effect. If it is replaced by spiral tube, the punching effect should be ensured, and the rigidity and hardness of the tube should be ensured under the action of spiral bone. After testing, the hardness of stamping spiral duct is three times that of traditional non pipe, so it is widely used in laboratory and other fields in Europe and America.

Pipeline reinforcement is to ensure its performance, but not all pipelines need reinforcement. In addition to the spiral pipe, the diameter of the circular pipe is greater than or equal to 80mm, the length of the pipe is more than 1250mm, and the total area is more than 2M2; the side length of the rectangular pipe is greater than 630mm, the side length of the insulated pipe is greater than 800mm, the length of the pipe is greater than 1250mm or the single side area of the low-pressure air duct is greater than 1.2m2, and the medium and high-pressure pipeline is also required to be reinforced.

Bolts, nuts, washers and rivets selected by the pipeline shall be made of materials that meet the performance of the pipeline and do not produce electrochemical corrosion or galvanizing or other anti-corrosion measures. Core pull rivets cannot be selected. Steel frame and steel bar shall be adopted. Flange connection shall not be used for pipes. S-shaped cutting, right angle cutting and vertical cutting are not allowed.